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OSI MODEL 7 LAYERS EXPLAINED
- 1. OSI MODEL By A. Bathsheba Parimala Department of BCA and Networking
- 2. ISO PROPOSED OSI REFERENCE MODEL • Consist of Seven Layer • Physical Layer • Data Link Layer • Network Layer • Transport Layer • Session Layer • Presentation Layer • Application Layer
- 3. PHYSICAL LAYER • Physical connection between network nodes • Date are converted into bits • Provides mechanical, electrical functional and procedural characteristics
- 4. DATA LINK LAYER • Bits are converted into frame • Data reliability • Provides tools to establish, maintain and release • Functions • Initialization • Information segmentation • Error control • Data synchronization • Flow control
- 5. DATA LINK LAYER PROTOCOL • Character oriented protocol • Bit oriented protocol • HDLC protocol • Information frame • Superior frame • Slide window protocol
- 6. NETWORK LAYER • Frames converted into packet • Provides service to the transport layer • Congestion control • Connecting multiple network • Routing packet between source and destination
- 7. ROUTING PROTOCOLS • RIP – Routing Information Protocol • OSPF – Open Shortest Path First • BGP – Border Gate Way Protocol
- 8. TRANSPORT LAYER •Reliable to transmit the packet •Efficient •Cost effective •End to end connection
- 9. TRANSPORT SERVICE • Class 0: Simple class • Class 1: Error recovering class • Class 3: Multiplexing • Class 4: Error recovering multiplexing class
- 10. TRANSPORT LAYER: SERVICE PRIMITIVE •Listen •Connection •Send •Receive •Disconnect
- 11. SESSION LAYER • Data are transmitted at time interval • Dialog control • Token management • Synchronization • Half duplex • Activity management
- 12. PRESENTATION LAYER •Also called as Translation Layer •Transmit over the network •Translation – ASCII to EBCDIC •Encryption / Decryption •Compression / Decompression
- 13. APPLICATION LAYER • Also called as Desktop layer • Produce the data to be transferred over the network • Functions • Network virtual terminal • FTAM (File Transfer Access and Management) • Mail Services • Directory Services
- 14. THANK YOU